Why Does Treatment Timing for Plant Health Care Change Each Year?

A desk calendar in front of a backyard with green trees and near a bouquet of cut flowers.

Have you noticed that we don’t apply treatments at the same time every year? That’s because treatment timing is based on growing degree days, not the calendar date. See how that impacts your tree pest and disease treatments and why professionals get the best results by using this science-based method so schedule PHC applications.

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